<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>更新时的一个问题</title>
    <script type="text/javascript" src="../js/vue.js"></script>
</head>
<body>
     <!--准备好一个容器-->
     <div id="root">
           <h2>人员列表</h2>
           <button @click="updateMei">更新马冬梅的信息</button>
           <ul>
            <li v-for="(p,index) of persons" :key="p.id">
                {{p.name}}-{{p.age}}-{{p.sex}}
            </li>
           </ul>
     </div>
      <script type="text/javascript">
        Vue.config.productionTip = false
        
        const vm = new Vue({
            el:'#root',
            data:{
                persons:[
                {id:'001',name:'马冬梅',age:30,sex:'女'},
                {id:'002',name:'周冬雨',age:31,sex:'女'},
                {id:'003',name:'周杰伦',age:18,sex:'男'},
                {id:'004',name:'温兆伦',age:19,sex:'男'}
                ]
            },

            methods:{
                updateMei(){
                    this.persons.splice(0,1,{id:'001',name:'马老师',age:50,sex:'男'})
                }
            }
        })

      </script>
</body>
</html>